Pectus Excavatum in Cats
 
The sternum, or chest bone, is a long flat bone located in the center of the thorax, and the costal cartilages are the cartilages that connect the chest bone with the ends of the ribs. In pectus excavatum, the sternum and costal cartilages are deformed, resulting in a horizontal narrowing of the chest, primarily on the posterior side. In appearance, the middle of the chest appear to be flat or concave, rather than slightly convex.
 
Symptoms and Types